Abstract
Background: Crop straw is a valuable renewable biological resource. In this study, a mobile straw granulator was designed to fully and efficiently use crop straw. The key crushing mechanism device of the mobile straw granulator was also designed in detail.
Method: The first three natural frequencies and vibration modes of the roller crusher were obtained by applying ANSYS-Workbench software to the modal analysis of the roller crusher.
Results: The lowest natural frequency of the roller crusher was 165.83 Hz, which was higher than its working frequency of 30 Hz, whichwould not cause resonance. The three factors and three levels were tested using the average resistance of the blade as an index, edge angle, thickness, and the end width of the blade as the test factors.
Conclusion: The optimum parameter combination obtained by software analysis is blade edge angle of 30°, blade thickness of 8 mm, and blade width of 75 mm. With this parameter combination, the blade power consumption is the smallest, the service life is the largest, and the crushing effect is the best.
Keywords: Crop straw, crushing device, knife design, modal analysis, discrete element simulation, parameter optimization.
Graphical Abstract
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